B27t — Sicilian: Accelerated Pterodactyl, 4.c4 Qa5+

1.e4 c5 2.Nf3 g6 3.d4 Bg7 4.c4 Qa5+ * ○ Trait aux Blancs

Ouverture — Centre semi-ouvert

♔ Point de vue Blancs

8 7 6 5 4 3 2 1

abcdefgh

Atouts. Les Blancs s'appuient sur les cases fortes d5, e5 et g5 et la paire de fous.

Côté adverse. Le fou enfermé en c8 et le roi resté au centre.

En contrepartie. Le roi n'est pas encore à l'abri et plusieurs pièces dorment encore (le cavalier b1, les fous c1 et f1 et les tours a1 et h1).

Plans. O-O (Mettre le roi en sécurité, connecter les tours) ; Nc3 (Développer Nb1) ; Be3 (Développer Bc1) ; Bd3 (Développer Bf1) ; h3 (Empêcher ...Bg4).

♚ Point de vue Noirs

1 2 3 4 5 6 7 8

hgfedcba

Atouts. Les Noirs s'appuient sur la case forte b4, un fou actif en g7 et la paire de fous.

Côté adverse. Les fous enfermés en c1 et f1 et le roi resté au centre.

En contrepartie. Le roi n'est pas encore à l'abri et plusieurs pièces dorment encore (les cavaliers b8 et g8, le fou c8 et les tours a8 et h8).

Plans. O-O (Mettre le roi en sécurité, connecter les tours) ; ...d6 (Libérer Bc8) ; ...Nc6 (Développer Nb8) ; ...Nf6 (Développer Ng8) ; ...Bg4 (Clouer Nf3).

Avantages

Faiblesses adverses

Diagonale active

Plans

Structure de pions

	♔ Blancs	♚ Noirs
Pions doublés	—	—
Pions isolés	—	—
Arriérés	—	—
Chaînes	—	● f7→g6, h7→g6
Passés	—	—
Majorité	—	—

Cases

	♔ Blancs	♚ Noirs
Cases fortes	● d5 (2v0), ● e5 (2v1), ● g5 (2v0)	● b4 (2v0)
Cases faibles	● d4	—
Centre	● d5 (2v0), ● e5 (2v1)	—

Colonnes et diagonales

♔ Blancs

♚ Noirs

Pièces

	♔ Blancs	♚ Noirs
Bc1	● Bc1 Non développé (mob. 5)
Bf1	● Bf1 Non développé (mob. 2)
Bg7		● Bg7 Actif (mob. 5)
Bc8		● Bc8 Non développé (mob. 0)
Paire de fous	● Oui	● Oui
Non développées	5 (b1, c1, f1, a1, h1)	5 (b8, g8, c8, a8, h8)

Sécurité du roi

	♔ Blancs	♚ Noirs
Statut	● Au centre !	● Au centre !
Droits de roque	O-O / O-O-O	O-O / O-O-O

Thèmes

	♔ Blancs	♚ Noirs
Phase	Ouverture
Centre	semi-ouvert
Ruptures	● d4-d5, ● e4-e5	● …d7-d6, ● …d7-d5, ● …e7-e6, ● …e7-e5, ● …f7-f6, ● …f7-f5

Partie
1957 Reggio Emilia ch ITA – Round 6 – Grassi, Mario – 1-0 – Paoli, Enrico – G21 1. Nf3 g6 2. e4 Bg7 3. d4 c5 4. Nc3 b6 5. Be3 cxd4 6. Bxd4 f6 7. Bc4 Nc6 8. e5 fxe5 9. Nxe5 Bxe5 10. Bxe5 Nxe5
1957 WchT U26 04th – Round 12.2 – Abad Martin, Eloy – 0-1 – Forintos, Gyozo V – G154 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Nf6 5. Be2 O-O 6. O-O b6 7. dxc5 bxc5 8. Be3 Na6 9. Nd2 Rb8 10. Nc4 d6
1959 HUN Ch Budapest HUN – Round 3 – Bilek, Istvan – 1/2-1/2 – Haag, Ervin – G11 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be3 Nc6 6. Qd2 cxd4 7. Nxd4 Nxd4 8. Bxd4 Nf6 9. O-O-O O-O 10. Kb1 Rd8
1960 Leipzig olm fin-A – Round 1 – Barden, Leonard – 1/2-1/2 – Bilek, Istvan – G14 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Nc6 5. Be3 Qa5 6. Be2 Nf6 7. O-O Ng4 8. Bd2 cxd4 9. Nxd4 Bxd4 10. Bxg4 Bg7
1961 Budapest ch-HUN – Round 1 – Szabo, Ladislav – 1/2-1/2 – Haag, Ervin – G65 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be3 Nc6 6. Qd2 d6 7. d5 Ne5 8. Nxe5 Bxe5 9. Bb5+ Kf8 10. Bd3 Nf6
1961 GBR Ch 48th – Round 5.8 – Hindle, Owen Mark – 0-1 – Gibbs, Peter Campbell – G44 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be2 Nc6 6. d5 Nd4 7. O-O Nxf3+ 8. Bxf3 d6 9. Be2 Nf6 10. f4 Nd7
1961 Maroczy Memorial Budapest HUN – Round 1 – Pogats, Jozsef Jr. – 0-1 – Bilek, Istvan – G39 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Nc6 5. Be3 Qa5 6. Qd2 Nf6 7. h3 cxd4 8. Nxd4 Nxe4 9. Nxc6 Qxc3 10. bxc3 Nxd2
1961 Moscow Ch – Round ? – Vasiukov, Evgeni – 1-0 – Zakharov, Alexander V – G122 1. e4 g6 2. d4 Bg7 3. Nc3 c5 4. Nf3 Qa5 5. d5 d6 6. Nd2 Bxc3 7. bxc3 Qxc3 8. Rb1 Qa5 9. Bd3 a6 10. O-O b5
1961 Reggio Emilia ITA – Round 2 – Contedini, Ennio – 0-1 – Haag, Ervin – G2 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be3 Nf6 6. Qd2 Nc6 7. dxc5 Ng4 8. Nd5 Nxe3 9. Qxa5 Nxa5 10. fxe3 Rb8
1961 ROM Ch – Round 13 – Gunsberger, Alexander – 1/2-1/2 – Soos, Bela – G86 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be3 Nf6 6. Qd2 cxd4 7. Nxd4 Ng4 8. Nb3 Qd8 9. Bd4 Nf6 10. Be2 Nc6
1961 ROM Ch – Round 17 – Bozdoghina, Constantin – 1/2-1/2 – Drimer, Dolfi – G112 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be3 Nf6 6. Qd2 cxd4 7. Nxd4 Nc6 8. f3 d6 9. O-O-O O-O 10. Bc4 Nxd4
1961 ROM Ch – Round 9 – Radovici, Corvin – 1/2-1/2 – Drimer, Dolfi – G57 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Nc6 5. Be3 Qa5 6. Qd2 cxd4 7. Nxd4 Nf6 8. Nb3 Qd8 9. Be2 d6 10. O-O O-O
1962 Asztalos Memorial 5th – Round 5 – Radovici, Corvin – 1/2-1/2 – Haag, Ervin – G38 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. d5 d6 6. Be2 Bxc3+ 7. bxc3 Nf6 8. O-O Nxe4 9. Bd3 f5 10. c4 Nd7
1962 Budapest-Warsaw m – Round 1 – Filipowicz, Andrzej – 1/2-1/2 – Bilek, Istvan – G1 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be3 Nf6 6. Qd2 Nc6 7. d5 Nb4 8. Be2 Nxe4 9. Nxe4 Nxc2+ 10. Kd1 Qxd2+
1962 Capablanca Memorial – Round 12 – Ivkov, Borislav – 1/2-1/2 – Haag, Ervin – G121 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be3 Nc6 6. Qd2 Nf6 7. dxc5 Ng4 8. Bf4 Qxc5 9. h3 Qb4 10. O-O-O Bxc3
1962 Kislovodsk – Round ? – Mazukevich, AA. – 1-0 – Zakharov, Alexander V – G12 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be3 cxd4 6. Bxd4 Bxd4 7. Qxd4 Nf6 8. b4 Qd8 9. e5 Nc6 10. Qd2 Ng4
1962 Mar del Plata – Round 10 – Pilnik, Herman – 0-1 – Letelier Martner, Rene – G88 1. e4 c5 2. Nf3 g6 3. Nc3 Bg7 4. d4 Nc6 5. d5 Nd4 6. a4 d6 7. h3 e5 8. Nd2 f5 9. Nc4 Nf6 10. exf5 Bxf5
1962 Olympiad – Round ? – Rijd – 0-1 – Bilek, Istvan – G8 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be2 Nc6 6. Be3 Nf6 7. O-O Ng4 8. a3 Nxe3 9. fxe3 cxd4 10. exd4 d6
1962 Sarajevo – Round 8 – Bobotsov, Milko G – 1/2-1/2 – Bilek, Istvan – G46 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be3 Nf6 6. Nd2 cxd4 7. Nb3 Qc7 8. Bxd4 O-O 9. e5 Ne8 10. Nb5 Qd8
1962 Stockholm Interzonal – Round 10 – German, Eugenio – 0-1 – Bilek, Istvan – G86 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Nc6 5. Be3 Qa5 6. d5 Ne5 7. Nd2 d6 8. Be2 a6 9. O-O Nf6 10. h3 O-O
1962 Varna – Round 1 – Gheorghiu, Florin – 1/2-1/2 – Bilek, Istvan – G26 1. e4 g6 2. d4 c5 3. Nf3 Bg7 4. Nc3 Qa5 5. Be3 Nf6 6. Qd2 Nc6 7. dxc5 Ng4 8. Nd5 Nxe3 9. Qxa5 Nxc2+ 10. Kd2 Nxa5
1962 Varna ol (Men) qual-D – Round 1 – Cuero Reid, Maximo Javier – 0-1 – Bilek, Istvan – G2 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be2 Nc6 6. Be3 Nf6 7. O-O Ng4 8. a3 Nxe3 9. fxe3 cxd4 10. exd4 d6
1962 Varna ol (Men) qual-D – Round 5 – Konchi – 1-0 – Cobo Arteaga, Eldis – G20 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Qd3 Nc6 6. Qb5 cxd4 7. Qxa5 Nxa5 8. Nb5 Kd8 9. Nbxd4 Nc6 10. Be3 Nf6
1962 Varna olm – Round 1 – Matanovic, Aleksandar – 1-0 – Bilek, Istvan – G37 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be3 Nf6 6. Qd2 Nc6 7. dxc5 Qb4 8. Bd3 Ng4 9. O-O Nxe3 10. Qxe3 Qxb2
1963 Alekhine Memorial – Round 14 – Gligorić, Svetozar – 1-0 – Szabo, Laszlo – G95 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Nc6 5. d5 Nd4 6. Bd3 d6 7. Nxd4 cxd4 8. Ne2 Qb6 9. O-O Nf6 10. a4 a5
1963 Budapest Ch – Round 1 – Ozsvath, Andras – 0-1 – Forintos, Gyozo V – G30 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Nf6 5. Be2 O-O 6. dxc5 Qa5 7. O-O Qxc5 8. Be3 Qa5 9. Qd2 Nc6 10. Bh6 d6
1963 Capablanca Memorial – Round 11 – Jimenez Zerquera, Eleazar – 0-1 – Letelier Martner, Rene – G101 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Nc6 5. Be3 Qa5 6. d5 Ne5 7. Nxe5 Bxe5 8. Qd2 Nf6 9. f3 O-O 10. Bd3 d6
1963 CSR Ch – Round 14 – Fichtl, Jiri – 1-0 – Kavalek, Lubomir – G126 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. d5 b5 6. Nd2 a6 7. a4 b4 8. Nc4 Qd8 9. Nb1 d6 10. Bd3 Nf6
1963 WchT U26 10th – Round 3.2 – Weinstein, Raymond – 1-0 – Filipowicz, Andrzej – G25 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. d5 d6 6. Bd2 a6 7. Be2 Bg4 8. a4 Nd7 9. O-O Bxf3 10. Bxf3 Ngf6
1964 IBM-B – Round 6 – Kerkhoff, Leo J – 1/2-1/2 – Bertok, Mario Jr. – G16 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be3 Nf6 6. Nd2 cxd4 7. Nb3 Qc7 8. Nxd4 a6 9. Qd2 Nc6 10. f3 O-O
1964 POL-ch21 Warsaw POL – Round 10 – Kostro, Jerzy – 0-1 – Balcerowski, Witold – G26 1. e4 g6 2. d4 Bg7 3. Nc3 c5 4. Nf3 Nc6 5. d5 Nd4 6. Be2 d6 7. O-O Nxe2+ 8. Qxe2 Nf6 9. h3 O-O 10. Bf4 Qb6
1964 Tel Aviv olm fin-A – Round 13 – Zuidema, Coen – 1/2-1/2 – Bobotsov, Milko G – G281 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. d5 d6 6. Be2 Nd7 7. O-O a6 8. Bd2 Ngf6 9. a4 O-O 10. Re1 Rb8
1964 WchT U26 11. fin-A – Round 11.4 – Ostojic, Predrag – 1/2-1/2 – Adamski, Jan – G202 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Nc6 5. Be3 Qa5 6. Qd2 Nf6 7. dxc5 Ng4 8. Bc4 Nxe3 9. Qxe3 b6 10. cxb6 Rb8
1964 WchT U26 11. fin-A – Round 5.4 – Smejkal, Jan – 1/2-1/2 – Adamski, Jan – G89 1. d4 c5 2. e4 g6 3. Nf3 Bg7 4. Nc3 Nc6 5. Be3 Qa5 6. Qd2 Nf6 7. d5 Nb4 8. e5 Ng4 9. Bf4 f6 10. e6 dxe6
1964 WchT U26 11. qual-D – Round 2.2 – Schmidt, Wlodzimierz – 1-0 – Rabassa, Luis – G7 1. e4 g6 2. d4 Bg7 3. Nf3 c5 4. Nc3 Nc6 5. Be3 Qa5 6. Qd2 cxd4 7. Nxd4 Nf6 8. f3 Nxd4 9. Bxd4 O-O 10. O-O-O b5
1964 Zagreb – Round 6 – Antunac, Goran – 0-1 – Szabo, Laszlo – G31 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be3 Nc6 6. Qd2 Nf6 7. h3 cxd4 8. Nxd4 Nxe4 9. Nxe4 Qxd2+ 10. Nxd2 Nxd4
1965 Budapest – Round 1 – Hora, Vratislav – 0-1 – Filipowicz, Andrzej – G30 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be2 cxd4 6. Nxd4 Nc6 7. Be3 Nf6 8. O-O O-O 9. Nb3 Qc7 10. Qd2 Rd8
1965 POL Ch 22th – Round 7 – Fabian Henryk – 1/2-1/2 – Filipowicz, Andrzej – G37 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. d5 d6 6. Be2 Nf6 7. O-O O-O 8. Nd2 Qd8 9. a4 b6 10. Nc4 Ba6
1965 Tbilisi – Round 1 – Bokuchava, Alexander – 1-0 – Navarovszky, Laszlo – G39 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be3 Nf6 6. Qd2 Nc6 7. d5 Nb4 8. Be2 O-O 9. O-O d6 10. a3 Na6
1965 Tbilisi Tbilisi GEO – Round 1 – Gipslis, Aivars – 1/2-1/2 – Soos, Bela – G27 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be3 Nf6 6. Qd2 Nc6 7. dxc5 Ng4 8. Nd5 Nxe3 9. Qxa5 Nxc2+ 10. Kd2 Nxa5
1965 WchT U26 12. fin-A – Round 9 – Poutrus, WE. – 0-1 – Partos, Charles – G56 1. e4 c5 2. Nf3 g6 3. Nc3 Bg7 4. d4 Qa5 5. Bd2 cxd4 6. Nb5 Qb6 7. Bd3 Nc6 8. a4 d6 9. O-O a6 10. Na3 Nf6
1966 La Habana olm prel – Round 3 – Villarroel, Geber – 0-1 – Forintos, Gyozo V – G54 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be3 Nf6 6. Qd2 cxd4 7. Nxd4 Nc6 8. f3 d6 9. O-O-O Bd7 10. Bc4 Rb8
1966 La Habana olm prel – Round 4 – Cornelis, Frans B – 0-1 – Villarroel, Geber – G143 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Bc4 cxd4 6. Nxd4 Qc5 7. Bxf7+ Kxf7 8. Be3 Qa5 9. O-O Nf6 10. f4 Rf8
1966 Panamerican – Round ? – Alvarez del Monte, Jose – 0-1 – Letelier Martner, Rene – G80 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Nc6 5. Be3 Qa5 6. Be2 Nf6 7. O-O Ng4 8. Bf4 cxd4 9. Nb5 O-O 10. Nfxd4 Nxd4
1966 Reggio Emilia 6667 09th – Round 7 – Ciric, Dragoljub M – 1-0 – Capece, Adolivio – G21 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be3 Nc6 6. Qd2 cxd4 7. Nxd4 Nf6 8. Nb3 Qd8 9. f3 d6 10. O-O-O O-O
1966 Rubinstein Memorial 04th – Round 2 – Damjanovic, Mato – 1-0 – Filipowicz, Andrzej – G9 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be3 Nf6 6. Qd2 Nc6 7. dxc5 Ng4 8. Bc4 Qb4 9. Bb3 Nxe3 10. Qxe3 Nd4
1966 Rzeszow ch POL – Round 13 – Witkowski, Stefan – 0-1 – Adamski, Jan – G87 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Nc6 5. Be3 Qa5 6. d5 Ne5 7. Nd2 d6 8. Be2 Nf6 9. f4 Ned7 10. e5 dxe5
1966 Rzeszow ch POL – Round 7 – Tarnowski, Alfred – 1/2-1/2 – Filipowicz, Andrzej – G48 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be2 Nc6 6. d5 Nd4 7. Bd2 Nxf3+ 8. gxf3 d6 9. O-O a6 10. a4 Nf6
1966 Titovo Uzice – Round 1 – Gligorić, Svetozar – 1-0 – Soos, Bela – G35 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be3 Nf6 6. Nd2 cxd4 7. Nb3 Qc7 8. Nxd4 Nc6 9. Be2 O-O 10. O-O d6
1968 Lugano ol (Men) – Round 1 – Johansson, Martin 1979 – 1-0 – Ornithopoulos, Nikolaos – G68 1. e4 g6 2. d4 Bg7 3. Nf3 c5 4. Nc3 Qa5 5. Be3 Nc6 6. Qd2 Nf6 7. dxc5 Ng4 8. Bf4 Qxc5 9. h3 Nge5 10. Nxe5 Bxe5
1968 Wijk aan Zee II – Round 11 – Ostojic, Predrag – 1-0 – Vyslouzil, A. – G43 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 b6 5. dxc5 Bb7 6. cxb6 Qxb6 7. Bd3 Bxc3+ 8. bxc3 Nf6 9. Qe2 O-O 10. e5 Nd5
1968 YUG Ch 23th – Round 13 – Mestrovic, Zvonimir – 1/2-1/2 – Nikolic, Stanimir – G66 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Nc6 5. Be3 Qb6 6. Nd5 Qa5+ 7. Bd2 Qd8 8. Bf4 d6 9. dxc5 Bxb2 10. cxd6 exd6
1969 Corr ch HUN sf – Round ? – Schrancz, Istvan – 1/2-1/2 – Kossik, J – G7 1. e4 c5 2. Nf3 g6 3. d4 Bg7 4. Nc3 Qa5 5. Be3 Nf6 6. Qd2 Nc6 7. dxc5 Ng4 8. Bc4 Nxe3 9. Qxe3 Nb4 10. Bb3 1/2-1/2

B27t — Accelerated Pterodactyl

1.e4 c5 2.Nf3 g6 3.d4 Bg7 4.Nc3

Eval: [+0.18]

Les coups candidats

4…cxd4 — 79.7% (4469 parties)

Ambassadeurs : Vesselovsky, Serguei (30x), Forintos, Gyozo V (21x), Ekebjaerg, Ove (17x), Kislinsky, Alexey (17x), Hoffman, Alejandro (17x), Leon Hoyos, Manuel (14x), Wojtkiewicz, Aleksander (11x), Walentukiewicz, Michal (11x)

4…Qa5 — 13.8% (775 parties)

Ambassadeurs : Kaposztas, Miklos (47x), Bilek, Istvan (27x), Gutierrez Herrera, Jose Antonio (14x), Donko, Matyas (14x), Jakab, Attila (14x), Filipowicz, Andrzej (13x), Krizsan-Bilek, Gyulane (10x), Bangiev, Alexander (10x)

4…Nc6 — 4.9% (275 parties)

Ambassadeurs : Haase, Wolfgang (6x), Adamski, Jan (4x), Bilek, Istvan (4x), Letelier Martner, Rene (4x), Hellwege, Werner (4x), Kuich, Gero (4x), Saulin, Dmitri (4x), Wahjuwidajat, Utut Adianto (3x)

4…b6 — 0.6% (31 parties)

Ambassadeurs : Golyak, Isay G (2x), Gandolfi, Fred (2x), Archakova, Galina (1x), Krizsan-Bilek, Gyulane (1x), Ostojic, Predrag (1x), Vyslouzil, A. (1x), Grassi, Mario (1x), Paoli, Enrico (1x)

Analyse statistique des coups candidats

Répartition par niveau Elo (% des parties)

Tranche Elo	N parties	4…cxd4	4…Qa5	4…Nc6	4…b6
<1800	188	85%	8%	5%	1%
1800-2200	2178	81%	12%	5%	1%
2200-2600	2014	82%	14%	3%	0%
2600+	25	100%	—	—	—

Évolution par décennie (% des parties)

Décennie	N parties	4…cxd4	4…Qa5	4…Nc6	4…b6
1880s	1	100%	—	—	—
1890s	2	100%	—	—	—
1900s	3	100%	—	—	—
1920s	1	100%	—	—	—
1940s	1	100%	—	—	—
1950s	13	46%	8%	31%	8%
1960s	300	63%	24%	12%	1%
1970s	219	67%	24%	6%	1%
1980s	212	73%	21%	3%	1%
1990s	823	76%	15%	6%	1%
2000s	1805	82%	13%	5%	0%
2010s	1954	84%	11%	4%	0%
2020s	274	85%	10%	3%	1%

Tendances récentes (2010s → 2020s)

Coup	2010s	2020s	Δ
4…cxd4	84%	85%	▲ +1.4%
4…Qa5	11%	10%	▼ -1.6%
4…Nc6	4%	3%	▼ -0.6%
4…b6	0%	1%	+0.4%

Joueurs célèbres

Champions du monde dans cette position

Hou, Yifan — 3 parties
Tal, Mikhail — 2 parties
Carlsen, Magnus — 2 parties
Steinitz, Wilhelm — 1 partie
Botvinnik, Mikhail — 1 partie
Kramnik, Vladimir — 1 partie

Parties historiques

4…cxd4 — 79.7% (4469 parties)

1887 — Noa, Joseph vs Von Gottschall, Hermann — 1-0 — Frankfurt GER
1894 — Steinitz, Wilhelm vs Hymes, Edward — 1/2-1/2 — Newark, NJ USA
1899 — Schlechter, Carl vs Bird, Henry — 1-0 — London ENG
1903 — Smith, Magnus vs Bruce, AW. — 1-0 — Winnipeg CAN
1905 — Schelfhout, Willem vs Blackburne, Joseph — 1-0 — Ostende

4…Qa5 — 13.8% (775 parties)

1959 — Bilek, Istvan vs Haag, Ervin — 1/2-1/2 — HUN-ch Budapest HUN
1961 — Szabo, Ladislav vs Haag, Ervin — 1/2-1/2 — Budapest ch-HUN
1961 — Reicher, Emanoil-George vs Drimer, Dolfi — 1/2-1/2 — Romania
1961 — Contedini, Ennio vs Haag, Ervin — 0-1 — Reggio Emilia ITA
1961 — Gunsberger, Alexander vs Soos, Bela — 1/2-1/2 — Romania

4…Nc6 — 4.9% (275 parties)

1954 — Ivkov, Borislav vs Damljanovic, Milos — 1-0 — YUG ch sf
1958 — Estrin, Yakov vs Prokhorovich, Taras E — 1-0 — Moscow RUS
1959 — Tal, Mikhail vs Fischer, Robert J — 1/2-1/2 — Bled/Zagreb/Belgrade
1959 — Nyikityin vs Bilek, Istvan — 0-1 — Budapest HUN
1960 — De Souza Mendes, Joao vs Gadia, Olicio — 1/2-1/2 — Fortaleza BRA

4…b6 — 0.6% (31 parties)

1957 — Grassi, Mario vs Paoli, Enrico — 1-0 — Reggio Emilia ch ITA
1962 — Archakova, Galina vs Krizsan-Bilek, Gyulane — 1-0 — Minsk BLR
1968 — Ostojic, Predrag vs Vyslouzil, A. — 1-0 — Wijk aan Zee II
1972 — Packroff, Hermann vs Pape, Manfred — 1/2-1/2 — Leipzig GER
1976 — Bergstrom, Christer vs Hickl, Thomas — 1/2-1/2 — Bremen GER

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